subframe connectors

What are folks experiences with subframe connectors? I assume they are necessary for putting a 440 in a 67 barracuda. Probably the first modification I will make.

Probably a wise choice. I added them to my Dart Sport and I'm here to tell ya they DO make a difference. I noticed it as soon as I backed out of the garage and onto the street.

As has been said, make your own, very inexpensive and easy to do.